The Mészáros effect refers to a phenomenon in astrophysics, particularly in the study of gamma-ray bursts (GRBs). It is named after the Hungarian astrophysicist Pál Mészáros. The effect is primarily associated with the late-time behavior of GRBs and relates to the mechanisms of energy release and emission from these astronomical events.
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The Mészáros effect is the suppression of subhorizon cold-dark-matter growth during radiation domination. The growing solution is only logarithmic until matter-radiation equality.